<?php

if (! defined('BASEPATH'))
    exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package CodeIgniter
 * @author ExpressionEngine Dev Team
 * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license http://codeigniter.com/user_guide/license.html
 * @link http://codeigniter.com
 * @since Version 1.0
 * @filesource
 *
 */
    
// ------------------------------------------------------------------------

/**
 * CodeIgniter String Helpers
 *
 * @package CodeIgniter
 * @subpackage Helpers
 * @category Helpers
 * @author ExpressionEngine Dev Team
 * @link http://codeigniter.com/user_guide/helpers/string_helper.html
 */
    
// ------------------------------------------------------------------------

/**
 * Trim Slashes
 *
 * Removes any leading/trailing slashes from a string:
 *
 * /this/that/theother/
 *
 * becomes:
 *
 * this/that/theother
 *
 * @access public
 * @param
 *            string
 * @return string
 */
if (! function_exists('trim_slashes')) {

    function trim_slashes ($str)
    {
        return trim($str, '/');
    }
}

// ------------------------------------------------------------------------

/**
 * Strip Slashes
 *
 * Removes slashes contained in a string or in an array
 *
 * @access public
 * @param
 *            mixed string or array
 * @return mixed or array
 */
if (! function_exists('strip_slashes')) {

    function strip_slashes ($str)
    {
        if (is_array($str)) {
            foreach ($str as $key => $val) {
                $str[$key] = strip_slashes($val);
            }
        } else {
            $str = stripslashes($str);
        }
        
        return $str;
    }
}

// ------------------------------------------------------------------------

/**
 * Strip Quotes
 *
 * Removes single and double quotes from a string
 *
 * @access public
 * @param
 *            string
 * @return string
 */
if (! function_exists('strip_quotes')) {

    function strip_quotes ($str)
    {
        return str_replace(array(
                '"',
                "'"
        ), '', $str);
    }
}

// ------------------------------------------------------------------------

/**
 * Quotes to Entities
 *
 * Converts single and double quotes to entities
 *
 * @access public
 * @param
 *            string
 * @return string
 */
if (! function_exists('quotes_to_entities')) {

    function quotes_to_entities ($str)
    {
        return str_replace(array(
                "\'",
                "\"",
                "'",
                '"'
        ), array(
                "&#39;",
                "&quot;",
                "&#39;",
                "&quot;"
        ), $str);
    }
}

// ------------------------------------------------------------------------

/**
 * Reduce Double Slashes
 *
 * Converts double slashes in a string to a single slash,
 * except those found in http://
 *
 * http://www.some-site.com//index.php
 *
 * becomes:
 *
 * http://www.some-site.com/index.php
 *
 * @access public
 * @param
 *            string
 * @return string
 */
if (! function_exists('reduce_double_slashes')) {

    function reduce_double_slashes ($str)
    {
        return preg_replace("#(^|[^:])//+#", "\\1/", $str);
    }
}

// ------------------------------------------------------------------------

/**
 * Reduce Multiples
 *
 * Reduces multiple instances of a particular character. Example:
 *
 * Fred, Bill,, Joe, Jimmy
 *
 * becomes:
 *
 * Fred, Bill, Joe, Jimmy
 *
 * @access public
 * @param
 *            string
 * @param
 *            string the character you wish to reduce
 * @param
 *            bool TRUE/FALSE - whether to trim the character from the
 *            beginning/end
 * @return string
 */
if (! function_exists('reduce_multiples')) {

    function reduce_multiples ($str, $character = ',', $trim = FALSE)
    {
        $str = preg_replace('#' . preg_quote($character, '#') . '{2,}#', 
                $character, $str);
        
        if ($trim === TRUE) {
            $str = trim($str, $character);
        }
        
        return $str;
    }
}

// ------------------------------------------------------------------------

/**
 * Create a Random String
 *
 * Useful for generating passwords or hashes.
 *
 * @access public
 * @param
 *            string type of random string. basic, alpha, alunum, numeric,
 *            nozero, unique, md5, encrypt and sha1
 * @param
 *            integer number of characters
 * @return string
 */
if (! function_exists('random_string')) {

    function random_string ($type = 'alnum', $len = 8)
    {
        switch ($type) {
            case 'basic':
                return mt_rand();
                break;
            case 'alnum':
            case 'numeric':
            case 'nozero':
            case 'alpha':
                
                switch ($type) {
                    case 'alpha':
                        $pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
                        break;
                    case 'alnum':
                        $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
                        break;
                    case 'numeric':
                        $pool = '0123456789';
                        break;
                    case 'nozero':
                        $pool = '123456789';
                        break;
                }
                
                $str = '';
                for ($i = 0; $i < $len; $i ++) {
                    $str .= substr($pool, mt_rand(0, strlen($pool) - 1), 1);
                }
                return $str;
                break;
            case 'unique':
            case 'md5':
                
                return md5(uniqid(mt_rand()));
                break;
            case 'encrypt':
            case 'sha1':
                
                $CI = & get_instance();
                $CI->load->helper('security');
                
                return do_hash(uniqid(mt_rand(), TRUE), 'sha1');
                break;
        }
    }
}

// ------------------------------------------------------------------------

/**
 * Add's _1 to a string or increment the ending number to allow _2, _3, etc
 *
 * @param string $str
 *            required
 * @param string $separator
 *            What should the duplicate number be appended with
 * @param string $first
 *            Which number should be used for the first dupe increment
 * @return string
 */
function increment_string ($str, $separator = '_', $first = 1)
{
    preg_match('/(.+)' . $separator . '([0-9]+)$/', $str, $match);
    
    return isset($match[2]) ? $match[1] . $separator . ($match[2] + 1) : $str .
             $separator . $first;
}

// ------------------------------------------------------------------------

/**
 * Alternator
 *
 * Allows strings to be alternated. See docs...
 *
 * @access public
 * @param
 *            string (as many parameters as needed)
 * @return string
 */
if (! function_exists('alternator')) {

    function alternator ()
    {
        static $i;
        
        if (func_num_args() == 0) {
            $i = 0;
            return '';
        }
        $args = func_get_args();
        return $args[($i ++ % count($args))];
    }
}

// ------------------------------------------------------------------------

/**
 * Repeater function
 *
 * @access public
 * @param
 *            string
 * @param
 *            integer number of repeats
 * @return string
 */
if (! function_exists('repeater')) {

    function repeater ($data, $num = 1)
    {
        return (($num > 0) ? str_repeat($data, $num) : '');
    }
}


/* End of file string_helper.php */
/* Location: ./system/helpers/string_helper.php */